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Preparation method and application of ethyl silicon oil

A technology of ethyl silicone oil and ethyl cyclosiloxane, which is used in pharmaceutical formulations, cosmetic preparations, cosmetic preparations, etc., can solve the problems of high residual acid value of ethyl silicone oil and cannot be used in cosmetics, etc., and achieves molecular weight The effect of uniform distribution, controllable viscosity and low acid value

Active Publication Date: 2014-03-12
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the current problem that ethyl silicone oil cannot be used in cosmetics due to its high residual acid value, the invention provides a preparation method of ethyl silicone oil and its application in cosmetics. The prepared ethyl silicone oil has good transparency, High yield, low acid value, good stability

Method used

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  • Preparation method and application of ethyl silicon oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Add 350Kg hexaethylcyclotrisiloxane, 5Kg hexaethyldisiloxane, 1.75Kg cerium magnesium phosphotungstate (Mg 0.5 Cs 1.5 h 0.5 PW 12 o 40 ) stirring, the temperature is controlled at 40°C, ring-opening polymerization is carried out for 4-6 hours, the catalyst is removed by filtration, the temperature is raised to 180°C, and the low molecular weight is removed by controlling the vacuum degree above -0.095MPa to obtain clear and transparent ethyl silicone oil 1.

[0023] The single-pass conversion rate of ethyl silicone oil 1 is 85.62%, and the viscosity is 100mm 2 / s (25°C).

Embodiment 2

[0025] Add 350Kg hexaethylcyclotrisiloxane, 6Kg hexaethyldisiloxane, 1.75Kg cerium aluminum phosphotungstate (Al 0.5 C 0.5 PW 12 o 40 ) stirring, the temperature is controlled at 70°C, ring-opening polymerization for 4-6h, the catalyst is removed by filtration, the temperature is raised to 200°C, and the low molecular weight is removed by controlling the vacuum degree above -0.095MPa to obtain clear and transparent ethyl silicone oil 2.

[0026] The single-pass conversion rate of ethyl silicone oil 2 is 86.73%, and the viscosity is 75mm 2 / s (25°C).

Embodiment 3

[0028] Add 350Kg octaethylcyclotetrasiloxane, 4Kg hexaethyldisiloxane, 4Kg cerium aluminum phosphotungstate (Al 0.1 Cs 2.2 h 0.5 PW 12 o 40 ) stirring, the temperature was controlled at 100°C, ring-opening polymerization was carried out for 2-3 hours, the catalyst was removed by filtration, the temperature was raised to 150°C, and the low molecular weight was removed by controlling the vacuum degree above -0.095MPa to obtain clear and transparent ethyl silicone oil 3.

[0029] The single-pass conversion rate of ethyl silicone oil 3 is 84.58%, and the viscosity is 300mm 2 / s (25°C).

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Abstract

The invention relates to the chemical filed of organic silicon and provides a preparation method of ethyl silicon oil for solving a problem that ethyl silicon oil cannot be applied to cosmetics due to higher residual acid value in the prior art. The preparation method comprises the following steps: carrying out polymerization reaction under action of a solid super acid catalyst by taking ethyl cyclosiloxane as the material and taking hexaethyldisiloxane as an end-capping reagent; then, filtering, removing the catalyst, reducing pressure to remove low-boiling-point substance, i.e., low molecules to obtain the ethyl silicon oil. The prepared ethyl silicon oil has characteristics of being good in transparency, high in yield, low in acid value, good in stability, uniform in molecular weight distribution, controllable in viscosity, good in repeatability, and the like, and is applied to cosmetics.

Description

technical field [0001] The invention relates to the field of organosilicon chemical industry, and specifically designs a method for preparing ethyl silicone oil for cosmetics. Background technique [0002] Methyl silicone oil is an important additive in cosmetics, which can effectively improve or affect the effect of cosmetics. For example, adding silicone oil to hair care products, care products, skin care products, etc. can increase their comfort and impart luster. Moreover, silicone oil is a colorless and transparent liquid, which will not affect the appearance and color of the product after addition; its low surface energy property can make cosmetics spread well; its physiological inertia, no stimulation to human skin, and high safety. However, the preparation of methyl silicone oil is generally catalyzed by sulfuric acid or sulfonic acid resin, and there are often residual catalysts in the product that are not easy to remove, and the acid value is high, thereby reducin...

Claims

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Application Information

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IPC IPC(8): C08G77/08A61K8/891
Inventor 张飞豹倪勇蒋剑雄许文东
Owner HANGZHOU NORMAL UNIVERSITY
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